I know Heidevolk already, and they're ok, but I'm looking for bands who sing in Dutch with words that are somewhat decipherable. So most death metal is probably out of scope, unless the enunciation and production are great. The point is I want to learn more Dutch while being passive and listening to music. There's nothing wrong with Heidevolk, I just want some variety in my Dutch-speaking metal, maybe themes that have less to do with "Brothers fighing".

I'm fine with Flemish or other varieties, as long as they are spoken today.

most bands that i know with lyrics in dutch tend to be more black metal based. One former singer of Heidevolk now plays in Wederganger for example. There is also this mini black metal scene based around Utrecht including bands such as Laster.

Perhaps not the most intelligible but try Heilig Vuur by Countess.

Ancient Rites have some discernible Dutch verses in a few songs. So it's still mostly English, but perhaps you're interested anyway.

https://youtu.be/lFyamLjBSWM

Try Alvenrad. It's a folk metal band that has Dutch lyrics. It also has some black metal-esque screams here and there, like a Dutch version of Аркона.

Akelei is a doom metal band from Tilburg that sings entirely in Dutch, with clean vocals.

Thanks all!